Island



UNIT D STATES ATENT OFFICE.

JOHN N. FOLSOM, OF PROVIDENCE, RHODE ISLAND.

LOCKING-VISE.

SPECIFICATION forming part of Letters Patent No. 438,104=, dated October '7, 1890.

Application filed March 26, 1890.

To aZZ whom it may concern.-

Be it known that I, JOHN N. FOLSOM, of the city and county of Providence, in the State of Rhode Island, have invented a certain new and useful Improvement in Locking-Vises; and I declare the following to be a specification thereof, reference beinghad to the accompanying drawing, which is a side elevation of my invention.

My invention relates to locking-Vises, and is especially adapted to blacksmiths use.

It consists of a fixed jaw supported vertically upon a standard and a pivoted jaw suitably mounted, which is pressed toward the fixed jaw and is locked in position bya lever, which lever is operated by a toggle-jointed link-connection and treadle, as hereinafter fully specified.

In the drawing, A is a fixed post, preferably of wood, and B is a metallic standard terminating at its top with the fixed jaw O of the vise. The standard B has a foot a, by which it is fastened to the floor by screws. It also has two horizontal brackets D E integral therewith, and is fastened to the post A by screws or bolts passing through the ear-pieces b. The movable jaw Fis pivoted to thelower bracket E at c, which is slotted or split for its reception, and said jaw F also passes through the upper bracket D,which is slotted or split at (Z for this purpose. A spring G, having its lower end inserted in a groove or slot of the standard B at c, has its upper free end bearing against the inner edge of the movable jaw F to throw it outwardly.

The post A and standard B are slotted transversely, as shown at f. The lever II is passed through said slot and has its fulcrum on the pivot h, which passes through a downwardly-projecting ear-piece of the lever H, as indicated by dotted lines. It terminates in front in a treadle J integral therewith. At its opposite end a link-bar I is pivoted to it at g. A locking-lever K has its fulcrum at min the bracket D, and its lower end is pivoted to the link-bar I at i. The locking-lever K is recessed at n on its inner side, and a steel plate L, having a bent or upset end, is loosely mounted in said recess. A set-screw M passes through the lever K and bears against the plate L. On the inner faces of the clamps or jaws are steel plates 0, which rest on sh0ul- {serial No. 345,489. (No model.

ders 19 of said jaws and are secured in position by bolts or screws (1.

When the vise is open, as shown in the drawing, the levers are in the position indicated by solid lines. By depressing the treadle J the lever H and link-barIare brought into a straight line, as shown in the drawing by dotted lines, and the locking-lever K is thereby forced outwardly. The pivot 77. of the lever H is not, however, in the same line with the joints g 2', but below said line, and the pressure upon said pivot causes a friction in a direction parallel with said lever II and linkbar I sufficient to lock the vise in position without the use of a ratchet, as in other locking-Vises, as it would not do if the pivots g h i were all in the same line. The upper end of the lever K is thus pressed with great power toward the jaw F against the intervening plate L, causing the jaws F O to seize and hold firmly whatever has been placed between them. As the lever H and link-bar I are then in line with each other, and the fulcrum h of the lever H is below the line of the joints gt' of the link-bar I, the lever K is immovably held and locks the vise. The vise is unlocked by raising the treadle J, and this movementbrings the parts to their former position, the spring G spreading thejaws open, as before.

The plate L is a rigid piece of metal and presents a hard and suitable wearing-surface between the setscrew M and the movable jaw F; otherwise the end of the screw M would move upon and wear into the edge of said jaw. The set-screw is used for the fine adj ustment of the clamps to properly seize the object interposed between them. The plates 0 serve to give a durable face to the clamps, and being detachable therefrom may be replaced by new ones when worn.

I claim as a novel and useful invention and desire to secure by Letters Patent- 1. In a looking-vise, the combination, with a standard,a fixed jaw, anupper bracket, a lower bracket, a movable jaw pivotally mounted on said lower bracket, and a spring, of a lockinglever pivoted to said upper bracket and adapted to press the movable jaw toward the fixed jaw, a treadle-lever having a downwardly-projecting ear-piece through which it is pivoted to the standard, and a link connect ing said locking-lever and treadle-lever and forming with the latter a toggle-joint to opcrate the locking lever, substantially as specified.

2. In a locking-vise, the combinati0n,with a standard, a fixed jaw, an upper bracket, alower bracket, a movable jaw pivotally mounted on said lower bracket, and a spring, of alockinglever pivoted to said upper bracket and adapted to press the movable jaw toward the fixed jaw, a treadle-lever having a down wardly-projecting ear-piece,through which it is pivoted to the standard, and a link connecting said locking-lever and treadle-lever and forming with the latter a toggle-joint to operate the locking-lever, a set-screw passing through the locking-lever, and a wearing-plate interposed between the locking-lever and movable jaw to receive the pressure of said screw, substantially as specified.

JOHN N. FOLSOM. Witnesses:

THOMAS A. J ENCKES, WARREN R. PEROE. 

